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Elucidating How Chondrocytes Maintain Cartilage Stability

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Biology".

Deadline for manuscript submissions: 20 February 2026 | Viewed by 3803

Special Issue Editor


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Guest Editor
1. Department of Orthopedics and Rehabilitation, Carver College of Medicine, University of Iowa, Iowa City, IA 52242, USA
2. Roy J. Carver Department of Biomedical Engineering, College of Engineering, University of Iowa, Iowa City, IA 52242, USA
3. Division of Pharmaceutical Sciences and Experimental Therapeutics, College of Pharmacy, University of Iowa, Iowa City, IA 52242, USA
Interests: orthopaedics; chondrocytes; osteoarthritis; arthrofibrosis; tissue engineering

Special Issue Information

Dear Colleagues,

The overall goal of this Special Issue is to address knowledge gaps that stand in the way of developing novel chondrocyte-based interventions to prevent, forestall, or reverse articular cartilage degeneration.

The unique physiologic adaptations that allow chondrocytes to maintain cartilage homeostasis are incompletely understood, as are the factors that disrupt homeostasis and lead to degeneration. Given the complexity of these processes, the way forward will likely involve detailed molecular analyses of data from cell and tissue culture models, as well as from animal models.

Significant knowledge gaps include the following: 

  • Mechano-transduction: While it is common knowledge that chondrocytes modulate ECM turnover in response to mechanical stresses, the signal transduction pathways that mediate these effects have not been fully elucidated.
  • Inter-cellular communication: Chondrocyte activities are profoundly influenced by factors secreted by other joint cells, including synoviocytes and bone cells. Research in other domains indicates that extracellular vesicles (EVs) play a major role in cell-to-cell communication; however, relatively little is known regarding the role of EVs in maintaining or disrupting cartilage homeostasis.
  • Cartilage repair/regeneration: Although stem and resident progenitor cells can be coaxed to produce a cartilage-like tissue, it is unclear to what extent this results in a fully functional, resilient ECM.
  • Chondrocyte aging: Age-related increases in chondrocyte apoptosis diminish cellularity, resulting in declines in the ability of chondrocytes to maintain cartilage homeostasis. However, there also appear to be metabolic changes associated with aging that disrupt homeostasis.
  • Therapeutic delivery: Efficient targeting of chondrocytes in vivo with minimal off-target effects will require advanced vehicles designed specifically for rate-controlled intra-articular delivery.

Dr. James A. Martin
Guest Editor

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Keywords

  • chondrocytes
  • articular cartilage
  • chondrogenesis
  • osteoarthritis
  • mechano-transduction
  • aging
  • extracellular matrix

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Published Papers (4 papers)

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Research

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21 pages, 6341 KB  
Article
Intra-Articular Delivery of Nanoemulsified Curcumin Ameliorates Joint Degeneration in a Chemically Induced Model of Osteoarthritis
by Kota Sri Naga Hridayanka, Shibsekhar Roy, Saikanth Varma, Navya Sree Boga, Archana Molangiri, Pradeep B. Patil, Myadara Srinivas, Asim K. Duttaroy and Sanjay Basak
Int. J. Mol. Sci. 2025, 26(22), 11212; https://doi.org/10.3390/ijms262211212 - 20 Nov 2025
Viewed by 779
Abstract
The pathogenesis of knee osteoarthritis (OA) is multifaceted and involves the complete joint microenvironment. Despite beneficial evidence of curcumin, the mechanistic insights of nanoemulsified curcumin (n-Cur) delivery to the knee-OA microenvironment are limited. The study aimed to establish localized delivery of curcumin nanoemulsion [...] Read more.
The pathogenesis of knee osteoarthritis (OA) is multifaceted and involves the complete joint microenvironment. Despite beneficial evidence of curcumin, the mechanistic insights of nanoemulsified curcumin (n-Cur) delivery to the knee-OA microenvironment are limited. The study aimed to establish localized delivery of curcumin nanoemulsion in the knee joint of OA rats and to examine detailed histopathological changes. n-Cur was prepared using a neutral dietary oil and a surfactant. Adult (5 mo) male SD rats were intra-articularly delivered 40 mg/mL of monoiodoacetate (MIA) to induce OA in the left knee and further treated with n-Cur (30 mg/mL). The effect of n-Cur on macrophage recruitment was evaluated using a co-culture model of CHON 001 and RAW 264.7 cells. In the MIA model, localized delivery of n-Cur significantly reduced knee joint edema and joint space narrowing in the target site. Curcumin ameliorated cartilage degeneration by reducing fibrillation, hypocellularity, and restoring matrix proteoglycan, as evidenced by histology. Reduced synovial inflammation displays the effect of curcumin on the synovium, possibly by lowering the recruitment of macrophages in chemoattractant-stimulated chondrocytes. Thus, curcumin nanoemulsion can act as a chondroprotective agent, modulating the OA microenvironment by reducing joint edema, synovial inflammation, and oxidative stress in the OA model. Full article
(This article belongs to the Special Issue Elucidating How Chondrocytes Maintain Cartilage Stability)
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15 pages, 2994 KB  
Article
Spatial Raman Spectroscopy to Characterize (Sulfated) Glycosaminoglycans in Human Articular Cartilage
by Andrea Schwab, Jannik Jahn, Kerstin Sitte, Christoph H. Lohmann, Jessica Bertrand and Sonja Gamsjaeger
Int. J. Mol. Sci. 2025, 26(20), 9875; https://doi.org/10.3390/ijms26209875 - 10 Oct 2025
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Abstract
Raman spectroscopy allows for analyzing local molecular matrix components while preserving spatial resolution in tissue samples. The aim of this study was to use Raman line scans to discriminate between healthy and diseased cartilage tissue based on the depth-dependent sulfated glycosaminoglycans (sGAG) and [...] Read more.
Raman spectroscopy allows for analyzing local molecular matrix components while preserving spatial resolution in tissue samples. The aim of this study was to use Raman line scans to discriminate between healthy and diseased cartilage tissue based on the depth-dependent sulfated glycosaminoglycans (sGAG) and total GAGs distribution. Full-thickness articular cartilage tissue was harvested from human individuals at different maturation stages (skeletally immature, skeletally mature) and from patients with diagnosed osteoarthritis. Raman spectroscopic line scans (30 µm step size) were utilized to analyze the sub-zonal sGAG (1062 cm−1) and total GAG (1370–1380 cm−1) distribution relative to the organic matrix (CH2 band 1430–1480 cm−1). We found a linear trend of the sGAG/CH2 ratio over the tissue depth in all samples (p < 0.0001). The total GAG/CH2 ratio of the skeletally immature and mature cartilage showed a characteristic non-linear behavior over the tissue distance. The elderly osteoarthritic cartilage exhibited lower total GAG/CH2 ratios compared to the ratios of the skeletally immature and mature samples, without a pronounced increase in the superficial area. Raman spectroscopic line scans are a fast and representative method allowing us to identify the local and tissue depth-dependent distribution of GAGs at higher specificity and resolution compared to histological staining. Full article
(This article belongs to the Special Issue Elucidating How Chondrocytes Maintain Cartilage Stability)
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10 pages, 2056 KB  
Article
Complete Loss of Cramp Promotes Experimental Osteoarthritis with Enhanced Chondrocyte Apoptosis in Mice
by Moon-Chang Choi, Jiwon Jo and Junghee Park
Int. J. Mol. Sci. 2025, 26(16), 7874; https://doi.org/10.3390/ijms26167874 - 15 Aug 2025
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Abstract
Osteoarthritis (OA) is the most prevalent form of joint arthritis, frequently associated with aging, mechanical wear, and inflammation. Our previous work demonstrated that cathelicidin-related antimicrobial peptide (Cramp) is upregulated in mouse OA cartilage, and that transient knockdown (KD) of Cramp in cultured chondrocytes [...] Read more.
Osteoarthritis (OA) is the most prevalent form of joint arthritis, frequently associated with aging, mechanical wear, and inflammation. Our previous work demonstrated that cathelicidin-related antimicrobial peptide (Cramp) is upregulated in mouse OA cartilage, and that transient knockdown (KD) of Cramp in cultured chondrocytes decreases IL-1β-induced expression of matrix-degrading enzymes. The aim of this study was to determine the in vivo role of Cramp in OA pathogenesis using whole-body Cramp knockout (KO) mice. Normal skeletal development and growth plate morphology were assessed in E18.5d embryos and 2-week-old mice, respectively. Expression profiles of catabolic and anabolic genes were analyzed in primary chondrocytes derived from Cramp KO mice. OA in mouse knee joints was induced using intra-articular monosodium iodoacetate (MIA) injections or surgical destabilization of the medial meniscus (DMM). We observed that Cramp loss does not impact normal skeletal development. In contrast to our expectations, complete Cramp deficiency in chondrocytes failed to decrease catabolic gene expression upon IL-1β stimulation. Instead, genetic deletion of Cramp significantly worsened OA cartilage degradation in both MIA- and DMM-induced models. The detrimental phenotype observed in Cramp-deficient mice results from enhanced chondrocyte apoptosis. Therefore, even minimal Cramp expression appears essential for maintaining catabolic balance and preventing chondrocyte apoptosis in OA cartilage. Collectively, our data indicate that Cramp may exert multifaceted effects on OA pathogenesis by modulating catabolic pathways and apoptosis. Full article
(This article belongs to the Special Issue Elucidating How Chondrocytes Maintain Cartilage Stability)
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Review

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21 pages, 1453 KB  
Review
Inflaming and Immune-Resolving: The Ambivalent Role of Eosinophils in Osteoarthritis
by Silvia Costantini, Paolo Dolzani, Veronica Panichi, Rosa Maria Borzì, Paulraj Balaji, Maria Daglia and Carla Renata Arciola
Int. J. Mol. Sci. 2025, 26(22), 10948; https://doi.org/10.3390/ijms262210948 - 12 Nov 2025
Viewed by 874
Abstract
Osteoarthritis (OA), the most prevalent form of arthropathy, is characterized by progressive degradation of cartilage, synovial inflammation, and other pathological changes that gradually affect the entire joint. Once regarded as a purely degenerative disease with minimal immune involvement, recent evidence reveals that chronic [...] Read more.
Osteoarthritis (OA), the most prevalent form of arthropathy, is characterized by progressive degradation of cartilage, synovial inflammation, and other pathological changes that gradually affect the entire joint. Once regarded as a purely degenerative disease with minimal immune involvement, recent evidence reveals that chronic low-grade inflammation, insidiously fueled by the destructive crosstalk between cartilage and synovium, plays a key role in OA pathophysiology. Among the immune cells involved, eosinophils have emerged as unexpected yet significant contributors, exhibiting both pro-inflammatory and immunoregulatory properties. Traditionally associated with allergic responses and antiparasitic defense, eosinophils can also secrete anti-inflammatory cytokines along with specialized pro-resolving lipid mediators (SPMs) that promote macrophage polarization toward reparative M2 phenotypes. Eosinophils may sustain inflammation or, conversely, act as “silent modulators” that subtly shape the immune microenvironment and support tissue homeostasis. This immunological plasticity positions them at the intersection of joint damage and repair. This article explores emerging evidence on eosinophil activity in OA, emphasizing their dual nature and potential as therapeutic targets to shift the joint milieu from a pro-inflammatory state toward resolution. Understanding eosinophil-mediated pathways may pave the way for novel strategies to reduce synovial inflammation, preserve cartilage integrity, and improve clinical outcomes. Full article
(This article belongs to the Special Issue Elucidating How Chondrocytes Maintain Cartilage Stability)
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